In ocean environment, the sound speed gradient of seawater has an important influence on far field sound propagation. The FEM/BEM is used to decouple the vibroacoustic radiation of the spherical shell, and the Green function of the virtual source chain is adopted for decoupling. For far field radiated Sound Pressure Level (SPL), the Beam Displacement Ray normal Mode (BDRM) is employed. The vibration and near-/far-field radiated SPL of spherical shell is analyzed in shallow sea uniform layer, negative/positive gradient, negative thermocline environment, and deep-sea sound channel. Results show that the vibroacoustic radiation of spherical shell acted at 300Hz can be analogous to dipole. When the radiated field of the spherical shell is dominated by large-grazing-angle waves, it can be analogous to vertically distributed dipole, and the far field radiated SPL is lower; while similar to horizontally distributed dipole if dominated by small-grazing-angle waves, and the far field SPL is high.


    Access

    Download


    Export, share and cite



    Title :

    A hybrid algorithm of underwater structure vibration and acoustic radiation-propagation in ocean acoustic channel


    Contributors:
    Jia-xi Duan (author) / Lin Zhang (author) / Liang-long Da (author) / Xue-hai Sun (author) / Wen-jing Chen (author)


    Publication date :

    2020




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Measuring acoustic propagation in the ocean

    Pyett, J.S. | Tema Archive | 1985


    Non-linear dynamics of acoustic ray propagation in an underwater sound channel

    Wiercigroch, M. / Cheng, A.H.D. | Tema Archive | 1996


    Research on Acoustic Velocity Correction Algorithm in Underwater Acoustic Positioning

    Zhang, Bingsheng / Xu, Tianhe / Gao, Ruru | British Library Conference Proceedings | 2018